My device is android 4.2.2, the network I tested is around 50 clients, after "grab all" the network is either very slow loading(50%) or cannot load(50%), it feels like router is overloaded, afterward click "kill all" is not making any different, some web still does open after attempt several times just like situation in "grab all".

However, it works perfect & instantly when in gingerbread(2.3) and old wifikill.

Not complaining and I cant ask for more than this awesome app, just sharing my review and hope it get better.